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Acoustic interferometer
About: Acoustic interferometer is a research topic. Over the lifetime, 1493 publications have been published within this topic receiving 19355 citations.
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05 Jan 2022
TL;DR: In this paper , the relationship between sound velocity and temperature has been known for nearly 100 years, but until recently it has been little used and errors such as leakage are absent and fast changes can be followed.
Abstract: Ultrasonic thermometers are based on the effect of the temperature on the velocity of sound waves in the medium transmitting the sound waves. Temperature measurements can be made in gases, liquids, or solids. The relationship between sound velocity and temperature has been known for nearly 100 years, but until recently it has been little used. Because the gas is the thermometer element, errors such as leakage are absent and fast changes can be followed. The acoustic velocity can be detected by immersing a rod or wire into the fluid or by using the medium itself as an acoustic conductor. The acoustic pulse is generated by a piezoelectric crystal cut to resonate at a frequency ranging from 0.5 to 3 MHz or by means of magnetostrictive materials. The thin wire sensor is installed like a thermocouple. A lead-in wire carries the pulse to the thin wire made of a material suitable for the process medium and its temperature range.